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The authors found that within two years, an improved diet led to large positive psychological benefits.

They found that people can increase life satisfaction simply by eating more fruit and veg.

In a less surprising observation, the study also found eating a diet rich in fruit and vegetables promotes longterm health benefits.

Andrew Oswald, Professor of Economics and Behavioural Science at the University of Warwick, said: “Eating fruit and vegetables apparently boosts our happiness far more quickly than it improves human health.